Atom 1.0

(This is a draft idea being implemented in the XML::Atom::Microformats Perl parsing module.)

To indicate that an Atom <content> element contains a Microformat, give the entry a <link rel="profile"> link to the relevant profile URI. You can indicate that all entries within a feed contain a particular microformat by including <link rel="profile"> on the root Atom <feed> element.

Content Management Systems

Implementations

GRDDL

Cognition

In "strict mode", Swignition (formerly called Cognition) refuses to parse any microformats where the profile URI has not been explicitly declared on the page. (It will however, still parse microformats for which there exists no profile URI!)

W3C HTML validator has very poor validation of attributes and is technically unable to check this case. The HTML DTD however defines profile attribute as %URI (it's an alias for CDATA), same as <a href> attribute.

Experimental URIs

The following includes URIs to external experimental XMDPs, and should only be used for testing purposes.

Experimental Combined Profile

The following URL covers all non-draft Microformats as of March 2008, except XMDP. You can mix and match it with other XMDP profiles for new/draft microformats.

Other Interesting Profile URIs

Discussion

Essentially dead

(copied from grddl): As someone who was an early proponent of GRDDL, I'd state that as of 2015-03, it is essentially dead along with any profile-based metadata systems including xmdp. The GRDDL specification relies on the profile attribute which has been deprecated in HTML5. Evidence to that effect: the W3C GRDDL reference service is offline, no attempt has been made to build an alternative that is HTML5-compliant (such as implementing html5-profile). It is probably time to call time of death on GRDDL and profile-uris. —Tom Morris 16:52, 16 March 2015 (UTC)